1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    *
5    *
6    *
7    * The contents of this file are subject to the terms of the Liferay Enterprise
8    * Subscription License ("License"). You may not use this file except in
9    * compliance with the License. You can obtain a copy of the License by
10   * contacting Liferay, Inc. See the License for the specific language governing
11   * permissions and limitations under the License, including but not limited to
12   * distribution rights of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portal.servlet.filters.gzip;
24  
25  import com.liferay.portal.kernel.util.StringPool;
26  
27  import java.io.IOException;
28  import java.io.OutputStreamWriter;
29  import java.io.PrintWriter;
30  
31  import javax.servlet.ServletOutputStream;
32  import javax.servlet.http.HttpServletResponse;
33  import javax.servlet.http.HttpServletResponseWrapper;
34  
35  /**
36   * <a href="GZipResponse.java.html"><b><i>View Source</i></b></a>
37   *
38   * @author Jayson Falkner
39   * @author Brian Wing Shun Chan
40   */
41  public class GZipResponse extends HttpServletResponseWrapper {
42  
43      public GZipResponse(HttpServletResponse response) {
44          super(response);
45  
46          _response = response;
47      }
48  
49      public void finishResponse() {
50          try {
51              if (_writer != null) {
52                  _writer.close();
53              }
54              else if (_stream != null) {
55                  _stream.close();
56              }
57          }
58          catch (IOException e) {
59          }
60      }
61  
62      public void flushBuffer() throws IOException {
63          if (_stream != null) {
64              _stream.flush();
65          }
66      }
67  
68      public ServletOutputStream getOutputStream() throws IOException {
69          if (_writer != null) {
70              throw new IllegalStateException();
71          }
72  
73          if (_stream == null) {
74              _stream = _createOutputStream();
75          }
76  
77          return _stream;
78      }
79  
80      public PrintWriter getWriter() throws IOException {
81          if (_writer != null) {
82              return _writer;
83          }
84  
85          if (_stream != null) {
86              throw new IllegalStateException();
87          }
88  
89          _stream = _createOutputStream();
90  
91          _writer = new PrintWriter(new OutputStreamWriter(
92              //_stream, _res.getCharacterEncoding()));
93              _stream, StringPool.UTF8));
94  
95          return _writer;
96      }
97  
98      private ServletOutputStream _createOutputStream() throws IOException {
99          return new GZipStream(_response);
100     }
101 
102     private HttpServletResponse _response = null;
103     private ServletOutputStream _stream = null;
104     private PrintWriter _writer = null;
105 
106 }